JPS5657027A - Cinecamera - Google Patents
CinecameraInfo
- Publication number
- JPS5657027A JPS5657027A JP13340979A JP13340979A JPS5657027A JP S5657027 A JPS5657027 A JP S5657027A JP 13340979 A JP13340979 A JP 13340979A JP 13340979 A JP13340979 A JP 13340979A JP S5657027 A JPS5657027 A JP S5657027A
- Authority
- JP
- Japan
- Prior art keywords
- light receiving
- focusing
- motor
- receiving element
- range finding
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Focusing (AREA)
- Automatic Focus Adjustment (AREA)
Abstract
PURPOSE: To improve the range finding precision and operation efficiency, by projecting the light emitting material image of the infrared emission diode to the object side from the main body of camera and by detecting the maximum value of the output voltage obtained by the light receiving element to perform focus detection.
CONSTITUTION: When the projection light from light emission diode 20 coincides with the light receiving range of light receiving element 23 on the object and the maximum value of the output voltage from light receiving element 23 is detected, motor M3 for focusing is rorated to perform the focusing operation. Worm 129 fixed to the output shaft of this motor M3 gears with worm wheel 121, and cam 121a is fixed to the worm wheel, and holding plate 105, cam ring 106, and front ball holding frame 107 are moved forward or backward in the optical axis direction through guide bar 109 according to normal or inverse rotation of motor M3, thereby performing focusing. Thus, the range finding precision is not dependent upon object luminance, and consequently, the range finding precision can be improved, and operation efficiency can be improved because driving force of the focusing lens is small.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13340979A JPS5657027A (en) | 1979-10-16 | 1979-10-16 | Cinecamera |
US06/196,441 US4351590A (en) | 1979-10-16 | 1980-10-14 | Motion picture camera with automatic focusing device |
DE3039155A DE3039155C2 (en) | 1979-10-16 | 1980-10-16 | Film camera with an automatic focusing device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13340979A JPS5657027A (en) | 1979-10-16 | 1979-10-16 | Cinecamera |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5657027A true JPS5657027A (en) | 1981-05-19 |
Family
ID=15104083
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13340979A Pending JPS5657027A (en) | 1979-10-16 | 1979-10-16 | Cinecamera |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5657027A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109814320A (en) * | 2019-03-07 | 2019-05-28 | 北京空间机电研究所 | A kind of focus adjusting mechanism based on disc cam |
-
1979
- 1979-10-16 JP JP13340979A patent/JPS5657027A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109814320A (en) * | 2019-03-07 | 2019-05-28 | 北京空间机电研究所 | A kind of focus adjusting mechanism based on disc cam |
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